Since as far as I can remember, she's worn skirts and dresses, so when she goes outside, she goes like that, even when it's snowing outside. She hates going out when it's cold because of this, so she'd never be convinced to go out every day. She'd probably go exercise in the summer, but it never lasts long because nobody else in our family exercises.
I'd also like to mention that, because of her lack of human contact, she's resorted to becoming friends with all the bums and drunks in the area. She gives them food and water and they feel grateful to her so they listen to her talk in exchange.